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I have an APAC ducted reverse cycle air conditioner Sundowner 11 which keeps shuddering intermitently at the outside unit. I have had a service technician look at it and he has replaced three contacters in the unit and checked the thermostat. He does not what the fault is. He has also by passed the pressure switches to see if this sorts out the problem. But this did not work. he has also checked the board in the unit as well.

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  • knottgordon Sep 18, 2008

    The technician has said that the unit is loosing it's signal on an intermittent basis but he can't determine what the cause of the signal dropout is. In answer to your question the shuddering is associated with the fan within the outdoor unit and occurs quite frequently. I can't say that I have heard any clicking noises when the shuddering happens. He has replaced all three contactors in the unit but this has not solved the problem. The pressure switches he bypassed were the heating and cooling pressure switches. He tried to determine if these switches were the problem, he said these switches were ok and took the bypass wires out after the test.

  • TexNOz May 11, 2010

    ACK!! The pressure switches he's "bypassed" are safety switches and should never be left bypassed.

    Can you please describe in great detail what the shuddering sounds and or feels like? Are there any associated noises that occur when it does this, such as a clicking noise?

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Listen to see if the contactors make a clicking noise when the fan starts to studder. If not, then it's not the signal to the contactors. If a clicking sound of the contactors can be heard, then the problem is the contactor coil dropping in and out. This could be a lose wire coming from the processor board, or a problem with the board itself. If no clicking is heard and the contactor is definitely not making and breaking the connection, then the problem could be a lose wire feeding power to the motor. This can be traced all the way back to where the power comes into the unit.

Posted on Sep 19, 2008

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